std::ranges::filter_view<V,Pred>::sentinel

class /*sentinel*/;

(since C++20)
(exposition only*)

The return type of filter_view::end when the underlying view type (V) does not model common_range.

Member name	Definition
`end_` (private)	The sentinel of the underlying `view`. (exposition-only member object*)

(constructor) (C++20)	constructs a sentinel (public member function)
base (C++20)	returns the underlying sentinel (public member function)

std::ranges::filter_view::sentinel::sentinel

`/sentinel/() = default;`	(1)	(since C++20)
`constexpr explicit /sentinel/( filter_view& parent );`	(2)	(since C++20)

1) Value-initializes end_ via its default member initializer (= ranges::sentinel_t<V>()).

2) Initializes end_ with ranges::end(parent.base_).

constexpr ranges::sentinel_t<V> base() const;

(since C++20)

Equivalent to return end_;.

(C++20)

compares the underlying iterator and the underlying sentinel
(function)

friend constexpr bool operator==( const /*iterator*/& x,
                                  const /*sentinel*/& y );

(since C++20)

Equivalent to return x.current_ == y.end_;, where current_ is the underlying iterator wrapped in filter_view::iterator.

The != operator is synthesized from operator==.

This function is not visible to ordinary unqualified or qualified lookup, and can only be found by argument-dependent lookup when std::ranges::filter_view::sentinel is an associated class of the arguments.

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